AN M20C EXPERIENCED A PWR LOSS WITH A ROUGH RUNNING ENG. THE PLT LANDED AT A NEARBY ARPT.

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ENRTE VFR IN IMC; RECEIVING VFR FLT FOLLOWING FROM APCH; THE ACFT'S ENG BEGAN RUNNING ROUGH. SWITCHING FUEL TANKS; APPLYING CARB HEAT; TURNING ON THE AUX FUEL PUMP; ADJUSTING MIXTURE AND INDIVIDUALLY SELECTING MAGNETO POS DID NOT DAMPEN THE ROUGHNESS AND I BEGAN TO CONSIDER A DIVERT. SUDDENLY PWR DROPPED DRAMATICALLY AND I TURNED TOWARD WLD; VERIFIED I HAD A TANK WITH FUEL SELECTED; AND INFORMED ATC OF THE PWR LOSS AND MY INTENTION. ATC DID NOT ASK NOR DID I REMEMBER TO SPECIFICALLY DECLARE AN EMER; BUT THE CTLR PERFORMED QUITE PROFESSIONALLY AND DID ASK FOR THE NUMBER OF 'SOULS' ON BOARD (ONE). PWR SEEMED TO RETURN SOMEWHAT; ALBEIT VERY ROUGHLY; WITH REAPPLICATION OF CARB HEAT (DESPITE THE DRY AIR) AND I WAS TEMPTED TO CONTINUE TO DEST; BUT THOUGHT THE BETTER OF IT AND CONTINUED TOWARD WLD. I ASKED ATC FOR THE FREQ FOR THE FIELD AND WAS GIVEN THE AWOS FREQ. SUGGESTION: CTLRS SHOULD HAVE IMMEDIATE ACCESS TO ALL LCL UNICOM FREQS. I LANDED UNDER PARTIAL PWR AT WLD AND PHONED APCH. I WANT TO COMMEND THE PROFESSIONALISM AND RESPONSE OF THE CTLR ON DUTY. HE HAD ALERTED LCL AUTHORITIES AND BEGAN A RESPONSE SHOULD I HAVE NOT MADE IT TO THE ARPT.